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Xing-Zheng Fu, Fei Xing, Li Cao, Chang-Pin Chun, Li-Li Ling, Cai-Lun Jiang and Liang-Zhi Peng

Zn is an essential micronutrient for plant growth and development. However, in citrus production, Zn deficiency is one of the most damaging and widespread nutritional disorders in both acidic and alkaline soils ( Srivastava and Singh, 2009 ). Zn

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Dámaris L. Ojeda-Barrios, Eloísa Perea-Portillo, O. Adriana Hernández-Rodríguez, Graciela Ávila-Quezada, Javier Abadía and Leonardo Lombardini

, pesca y alimentación, 2008 ). In fact, Zn deficiency is common in commercial pecan tree orchards, frequently limiting productivity in Zn-poor soils ( Fenn et al., 1990 ; Sparks and Payne, 1982 ). Some of the consequences of Zn deficiency in pecan

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Bruce W. Wood

Pecan is a zinc (Zn)-sensitive species possessing a relatively high Zn requirement ( Sparks, 1987 ; Swietlik, 1999 ). Zinc deficiency is a common, and often major, problem in commercial pecan orchards, especially those established on sandy well

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Richard J. Heerema, Dawn VanLeeuwen, Marisa Y. Thompson, Joshua D. Sherman, Mary J. Comeau and James L. Walworth

reduced by Zn deficiency through its detrimental effects on pistillate flower production, the number of nuts set and matured, and final individual nut weight ( Hu and Sparks, 1990 ). In addition, there are major reductions in commercially important pecan

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James L. Walworth, Scott A. White, Mary J. Comeau and Richard J. Heerema

above. Pecan trees growing in these soils are prone to Zn deficiency due to limited soil Zn availability ( Alloway, 2008 ; Malstrom and Fenn, 1981 ; Smith et al., 1980 ). Fenn et al. (1990) reported that water extractable Zn in a South Texas soil

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Yong Zhang, Chunxia Fu, Yujing Yan, Yan’an Wang, Ming Li, Meixiang Chen, Jianping Qian, Xinting Yang and Shuhan Cheng

starch synthesis ( Hacisalihoglu et al., 2003 ). The apple is among the four most popular fruits in the world, and as an essential fruit for human health, high fruit quality is important. Zn deficiencies affect production and quality of all crops

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Michael Pillay and Robert Fungo

Micronutrient malnutrition, particularly deficiencies in Fe and Zn, affects over three billion people in the world ( Salim-Ur-Rehman et al., 2010 ; Wang et al., 2011 ; Welch and Graham, 2004 ). Iron is an important component in human diets since

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Menahem Edelstein, Roni Cohen, Meital Elkabetz, Shimon Pivonia, Ami Maduel, Tom Sadeh-Yarok and M. Ben-Hur

concentrations by 40%, resulting in Mg-deficiency symptoms 19 weeks after grafting ( Savvas et al., 2009 , 2011 ). In grafted melon, the concentrations of heavy metals and microelements, including Mn, Zn, Cu, and B, were substantially lower than those measured

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Sasmita Mishra, Scott Heckathorn, Jonathan Frantz, Futong Yu and John Gray

( Table 1 ). In new expanding leaves, B deficiency increased the concentration of P (low and high light) and Zn (high light only; marginally significant), whereas K, Mg, and Mn decreased in concentration with B deficiency (marginally significant for Mg

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Meiling Zhang, Ming Chen, Zhen Wang, Ting Wu, Yi Wang, Xinzhong Zhang and Zhenhai Han

the highest relative content was Fe, and then were Zn and Mn. The relative contents of Ni and Co were obviously lower than the other three divalent metals ( Fig. 1 ). However, iron deficiency (−Fe) induced a significant increase in the relative